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AJAXJS Web aims to full-stack, not only the server-side framework, but also integrates the front-end library. It's written in HTML5 + Java, a successor to the JVM platform, efficient, secure, stable, cross-platform and many other advantages, but it abandoned the traditional enterprise architecture brought about by the large and bloated, emphasizing the lightweight, and fast, very suitable for the Internet fast application.

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/**
 * Copyright 2015 Sp42 [email protected]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.ajaxjs.security.wrapper;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.ajaxjs.util.CommonUtil;

public class XssChecker {

	private static String xssType = "]*?>.*?";

	private static Pattern xssPattern = Pattern.compile(xssType);

	private static String type_ESCAPSE = "escapse";

	public static String type_DELETE = "delete";

	/**
	 * 默认转义
	 * 
	 * @param input 输入内容
	 * @return
	 */
	public static String clean(String input) {
		return clean(input, type_ESCAPSE);
	}

	/**
	 * XSS 过滤器
	 * 
	 * @param input 输入内容
	 * @param filterType 过滤器类型
	 * @return
	 */
	public static String clean(String input, String filterType) {
		if (CommonUtil.isEmptyString(input))
			return input;

		if (filterType.equals(type_ESCAPSE)) {
			Matcher matcher = xssPattern.matcher(input);

			if (matcher.find())
				return matcher.group().replace("<", "<").replace(">", ">");
		} else if (filterType.equals(type_DELETE))
			return input.replaceAll(xssType, "");

		return input;
	}

	/**
	 * 过滤 for 数组
	 * 
	 * @param value
	 * @return
	 */
	public static String[] clean(String[] value) {
		if (CommonUtil.isNull(value))
			return null;

		String[] cleaned = new String[value.length];

		for (int i = 0; i < value.length; i++)
			cleaned[i] = clean(value[i]);

		return cleaned;
	}
}